org.n52.io.geojson.FeatureOutputSerializer Maven / Gradle / Ivy
/*
* Copyright (C) 2013-2019 52°North Initiative for Geospatial Open Source
* Software GmbH
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* If the program is linked with libraries which are licensed under one of
* the following licenses, the combination of the program with the linked
* library is not considered a "derivative work" of the program:
*
* - Apache License, version 2.0
* - Apache Software License, version 1.0
* - GNU Lesser General Public License, version 3
* - Mozilla Public License, versions 1.0, 1.1 and 2.0
* - Common Development and Distribution License (CDDL), version 1.0
*
* Therefore the distribution of the program linked with libraries licensed
* under the aforementioned licenses, is permitted by the copyright holders
* if the distribution is compliant with both the GNU General Public License
* version 2 and the aforementioned licenses.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
package org.n52.io.geojson;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.vividsolutions.jts.geom.Geometry;
import java.io.IOException;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class FeatureOutputSerializer extends JsonSerializer {
private static final Logger LOGGER = LoggerFactory.getLogger(FeatureOutputSerializer.class);
@Override
public void serialize(GeoJSONFeature value, JsonGenerator gen, SerializerProvider serializers)
throws IOException, JsonProcessingException {
writeFeature(value, gen);
}
private void writeFeature(GeoJSONFeature value, JsonGenerator gen) throws IOException {
gen.writeStartObject();
gen.writeStringField("id", value.getId());
Map properties = value.getProperties();
if (!properties.isEmpty()) {
gen.writeObjectField("properties", properties);
}
if (value.isSetGeometry()) {
gen.writeStringField("type", "Feature");
gen.writeObjectField("geometry", encodeGeometry(value));
}
gen.writeEndObject();
}
private Object encodeGeometry(GeoJSONFeature value) {
try {
final GeoJSONEncoder enc = new GeoJSONEncoder();
final Geometry geometry = value.getGeometry();
return enc.encodeGeometry(geometry);
} catch (GeoJSONException e) {
LOGGER.error("could not properly encode geometry.", e);
return null;
}
}
}